.sep{
    height: 60px;
}
.menu1{
    width: auto;
    height:40px;
    background: transparent url("../image/menu_bg.png") repeat-x left top;
    padding-left: 40px;
}
.menu1 ul{
    width: 1006px;
    height: 40px;
    margin: 0 ;
    padding: 0;
    list-style: none;
}
.menu1 li{
    float: left;
    width: 120px;
    text-align: center;
}
.menu1 a{
    display: block;
    text-decoration: none;
    line-height: 40px;
    color: #c82333;
}
.menu1 a:hover{
    color: #0cff1b;
}
.menu2{
    width: auto;
    height: 40px;
    background: #808080;
    padding-left:40px;
}
.menu2 ul{
    width: 1006px;
    height: 40px;
    margin: 0;
    padding: 0;
    list-style: none;
}
.menu2 li{
    float:left;
    width: 120px;
    text-align: center;
}
/*ul的高度为40px a的高度为： 行高（39px）+底边（1px）=（40px）*/
.menu2 li a{
    display: block;
    color: #fff;
    text-decoration: none;
    width: 119px;
    line-height: 40px;
    border-right: 1px solid #ccc;
    border-bottom: 1px solid #808080;
    background: #808080;
    margin: 0;
    text-align: center;
}
.menu2 li a:hover{
    background: #666666;
    border-bottom: 1px dashed;
}
/*默认隐藏下级菜单*/
.menu2 .submenu{
    visibility: hidden;
    width: 120px;
}
.menu2 li:hover .submenu{
    visibility: visible;
    position: relative;
    z-index: 100;
}
.menu2 .submenu li{
    float: none;
    height: 35px;
}
.menu2 .submenu a{
    background: #666666;
    line-height: 35px;
}
.menu2 .submenu a:hover{
    background: #333;
}

/*下拉菜单（子菜单为横向）*/
.menu3{
    width: auto;
    height: 40px;
    background: #55aaee;
    padding-left: 40px;
    position: relative;
}
.menu3 ul{
    width: 1006px;
    height: 40px;
    margin: 0;
    padding: 0;
    list-style: none;
}
.menu3 li{
    float: left;
    width: 120px;
}
.menu3 li a{
    display: block;
    color: #fff;
    width: 119px;
    margin: 0;
    text-align: center;
    text-decoration: none;
    border-right: 1px solid #ccc;
    border-bottom: 1px solid #55aaee;
    background: #55aaee;
    line-height: 39px;
}
.menu3 li a:hover{
    color: #c82333;
    background: #fff;
    border-bottom: 1px dashed #ff0000;
}
.menu3 .submenu{
    height:  180px;
    width: 947px;
    z-index: -1;
    display: none;
    position: absolute;
    left: 0;
    top: 40px;
    margin-left: 55px;
    border: 2px solid orange;
}
.menu3 .submenu li{
    height: 35px;
    width: 120px;
}
.menu3 .submenu a{
    color: #000;
    background: #fff;
    line-height: 35px;
    border: none;
}
.menu3 li:hover .submenu{
    display: block;
    background: #fff;
}